I bought my 2008 1.3 Copen in January. I was aware of a couple of spots of corrosion, i.e. rust discolouration just coming through at the bottom of the front arches behind the wheel, and two thumb-nail sized paint bubbles on the boot lid. I had the chance to look at the underneath of the car before I bought it and it didn't look too bad. Some rust on the chassis members, yes, but nothing you wouldn't expect on a 9 year car of any make. I took the car to a local paint shop who quoted £200 for the paint repairs. I then took it to a bigger body shop recommended by a friend, who do undersealing (and work on classic cars). They didn't have a ramp free, so he just peered underneath and had a feel around. I have been quoted £875 for the paintwork and the undersealing. This seems a lot, as I had my then 10-year old motorhome undersealed (albeit 6 years ago) at a specialist rust-proofing place for £490. I plan to go back and get this new place to look at it properly underneath and give me a breakdown of paintwork vs. underseal costs, but my question is, should I get it undersealed at all? I have read that it can do more harm than good if not properly prepared. The place I used for the motorhome is too far away to be practical. I have a garage with a pit, but can't get the Copen in, as it grounds on the slope, otherwise I would get underneath myself and do some work with Dinitrol, where it's needed. I don't mind paying out to look after my car, but don't want to risk making matters worse by inappropriate treatment.